I know you're all probably gonna laugh but this is an idea I have been thinking about for a while. I know a dude locally who makes glass and can hook me up so I am wondering if this is worth a try. The picture sucks but basically it would be all glass except for the metal screen between the unit and the glass bubble. The heating coils would be placed inside glass tubes so it might take a while to heat up and stabilize but I'm not really worried about that. You would just crack the o2 tank open until the bubble fills with vapor and then closed it. All connections would be sealed. Sorry if there is already a thread about using oxygen, but is there any advantages/disadvantages to using tanked o2? Is it even something to consider or is an air pump a better option. You can tear up the idea if you want. Just tell me what you think.